Convert Inches to Centimeters
Convert inches to centimeters using the exact 2.54 factor. Covers screen sizes, paper dimensions, body measurements, and common hardware specifications.
Detailed Explanation
Inches to Centimeters Conversion
The exact conversion factor is:
centimeters = inches × 2.54
This is an exact definition, not an approximation. The international inch was defined in 1959 as exactly 25.4 millimeters.
Quick Reference Table
| inches | cm | Common Use |
|---|---|---|
| 1 | 2.54 | Standard unit |
| 4 | 10.16 | Smartphone width |
| 6 | 15.24 | Smartphone height |
| 12 | 30.48 | 1 foot |
| 13.3 | 33.78 | Laptop screen |
| 15.6 | 39.62 | Laptop screen |
| 24 | 60.96 | Desktop monitor |
| 27 | 68.58 | Desktop monitor |
| 32 | 81.28 | TV / Large monitor |
Screen Diagonal Measurements
When manufacturers advertise a "15.6-inch laptop" or a "27-inch monitor," they are measuring the diagonal of the display. Converting to centimeters:
- 13.3” = 33.8 cm diagonal
- 15.6” = 39.6 cm diagonal
- 24” = 61.0 cm diagonal
- 27” = 68.6 cm diagonal
- 32” = 81.3 cm diagonal
Paper Sizes
US Letter paper (8.5 × 11 inches) converts to 21.59 × 27.94 cm, which is close to but not the same as the international A4 size (21.0 × 29.7 cm). This difference can cause layout issues when sharing documents internationally.
Body Measurements
The fashion industry frequently converts between inches and centimeters for sizing:
- Waist 32” = 81.3 cm
- Inseam 30” = 76.2 cm
- Chest 40” = 101.6 cm
Use Case
A web developer needs to understand physical screen dimensions when designing responsive layouts that account for actual device sizes rather than just pixel counts.